fix(ci): remove Java 17 from build matrix

All modules target Java 21; the Java 17 runner cannot compile
code with target release 21.

Author: sliedig

.github/workflows/build.yml

@@ -26,7 +26,7 @@ jobs:
       max-parallel: 4
       matrix:
         # test against latest LTS Java versions
-        java: [17, 21]
+        java: [21]
     name: Java ${{ matrix.java }}
     env:
       JAVA: ${{ matrix.java }}